On Thu, 2013-06-27 at 14:53 +1000, Alexey Kardashevskiy wrote:
>
> 2. remove locks from functions being called by VFIO. The whole table
> is given to the user space so it is responsible now for races.
Sure but you still need to be careful that userspace cannot cause things
that crash the kernel.
The locks in arch/powerpc/kernel/iommu.c were initally added to protect
iommu_table::it_map so the patch just makes things consistent.
Specifically, it does:
1. add missing locks for it_map access during iommu_take_ownership/
iommu_release_ownership execution where the entire it_map is marked
bus
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